C++ - std::set not declared [closed]

Question

#include <iostream>

 using std::set;
 using std::cout;
 using std::endl;

Error reported:

Josephus_Permutation.cpp:3:13: error: ‘std::set’ has not been declared

Shouldn't std::set be a STL of namespace std?

Answer 1

It is in the std namespace but you need to include the appropriate header:

#include <set>

The <iostream> header only contains the standard input/output library, which includes std::cout and std::endl. std::set, however, is defined in <set>.